You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Christine Adams.

ASSISTANT: How can I be at your service?

USER: Help me in changing my existing reservation.

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: There is no reservation found in your name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for contacting us, we hope to serve you again.