You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to change my existing reservation due to sudden change in my family trip dates. Can you help me in doing that?

ASSISTANT: Sure, may I know your name please?

USER: Laura Gonzalez here.

ASSISTANT: Please standby, I will revert to you.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thanks for choosing us.