You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Allen. I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Allen, how may I render you?

USER: Can you please help me with changing my reservation?

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

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.