You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning for some other trip, so I need to change my existing reservation, so will you help me to modify my reservation?

ASSISTANT: Sure, I will help you in changing the reservation. May I know your good name for verification?

USER: My name in previous reservation is Ashley Allen.

ASSISTANT: Ok, please wait a moment to check the existing reservation status.

USER: Ok, take your own time.

ASSISTANT: Thank you for waiting.

USER: You are welcome.

ASSISTANT: Sorry Allen, I did not came across your name in the reservation chart to change your reservation.

USER: It's ok, thank you for searching.

ASSISTANT: Most welcome. Thank you for choosing us. Have a good day.