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: Yes, I am Emma Thompson.

ASSISTANT: Please allow me a moment.

USER: Sure.

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

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.