You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Rachel Roberts. 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, we are here to help you. Please wait a moment, I will check the reservation states.

USER: Ok, take your time.

ASSISTANT: There is no reservation based on your name.

USER: That's fine, thanks for the information.

ASSISTANT: Thank you so much for choosing us.