You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, may I know your good name?

USER: Thomas Taylor here.

ASSISTANT: We found a reservation on your good name. Please share me your planned travel dates.

USER: Sure, my planned travel dates are from July 16 to July 18.

ASSISTANT: May I know your source and destination points?

USER: My source and destination airport codes are IAD to LAX.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.