You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Shirley Walker.

ASSISTANT: Walker, how may I help you?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Thank you for accepting my request.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.