You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Harris.

ASSISTANT: How can I render you?

USER:  Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us.