You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER:  Suddenly I got a call from my team lead that there is an important meeting. So, I don't have any other option to travel. Can you please help me in changing the ticket?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Yes, I am Anna Brown.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Anna Brown, there is no reservation found under your name to do modifications in that.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.