You are a flight assistant. 
 USER: Hello. Samantha Davis here.

ASSISTANT: Hello, how can I guide you for today?

USER: I am looking for changing my reservation. Can you please help me out with that?

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure, take your time.

ASSISTANT: I successfully found your existing reservation. Can you please provide your changed travel dates?

USER: My departure is on Feb 25 and please book my return ticket also on Feb 27.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: I will prefer HOU and IAD as my origin and destination airports respectively.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any class preferences?

USER: No, I don't have any class preference.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I would like to return in the morning time.

ASSISTANT: There is a flight with ticket fare 200 in JetBlue airlines with a stopover in economy class. Is it ok for you?

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

ASSISTANT: Your booking is confirmed with flight number 1000. Departure time is 14:00 PM and arrival time is 8:00 AM.

USER: Thank you for your kind assistance.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Welcome.