You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to modify the return journey date in the flight ticket which is booked previously because I have planned for the trip for some more days. Can you please help me to change the details?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Thank you. My name is Christopher Taylor.

ASSISTANT: Please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Christopher, there is no reservation found under your name.

USER: It's ok, not a problem with that one. Anyways thanks a lot for checking the ticket status.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.