You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Ruth Allen, want to change my existing reservation, because my friends are joining with me for a holiday trip. Will you help me in that?

ASSISTANT: Sure. Wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, There is no reservation found with your name.

USER: Ok. Thank you.

ASSISTANT: Thanks for choosing us.