You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. May I know your good name please?

USER: I am Steven Johnson.

ASSISTANT: How can I be at your service?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please wait for a moment to check with the reservation list?

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for being patience.

USER: My pleasure.

ASSISTANT: We did not find any reservation in our data base with your specified name.

USER: It's ok, not a problem. Thank you for your assistance.

ASSISTANT: Thanks for making us to serve you.