You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Christopher Jones here. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, let me go through the reservation list and revert you.

USER: Sure. I will wait.

ASSISTANT: Thanks for waiting, we could not find any reservation in our database by the name you provided.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for approaching us.