You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: As my friend's marriage has been preponed, help me in changing my reservation.

ASSISTANT: Sure, let me know your name to change your reservation?

USER: Angela Parker here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change your reservation.

USER: That's not a problem, thank you for your assistance.

ASSISTANT: Thanks for consulting us.