You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Gary Evans.

ASSISTANT: Happy to meet you Gary Evans.

USER: Can you help me in changing my existing reservation as I changed my trip?

ASSISTANT: Yes, please wait a minute. Actually, there is no reservation in your name.

USER: No issue, thank you.

ASSISTANT: Thank you for contacting us.