You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: I am looking for changing my reservation due to sudden health issues, can you please help me out with that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Sure, take your time.

ASSISTANT: Let me know your name to check your reservation status.

USER: Sure, I have reserved it on the name of Timothy Mitchell.

ASSISTANT: We have found a reservation on your name. Let me know your airport codes to proceed.

USER: That's great, my new journey airports are DEN and SFO.

ASSISTANT: Please, provide me your travel dates.

USER: I am planning to leave my location on June 28 and please book my return ticket also on June 30.

ASSISTANT: Do you have any connection limit?

USER: I will prefer single connection for my journey.

ASSISTANT: May I know your airline preference?

USER: I will prefer normal cost airline.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: United Airlines is providing you the connecting flight which departs at 19 PM and arrives at 10 AM. Shall I proceed?

USER: I am ok with this flight, you can proceed with booking now.

ASSISTANT: Your ticket has been confirmed with flight-1010 with a price of 200.

USER: Thank you for your help.

ASSISTANT: My pleasure.