You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER: I will be making few changes in my previous reservation, can you help me with it?

ASSISTANT: Sure, may I know your name to check for the previous reservation in our data base?

USER: My name is Rachel Smith.

ASSISTANT: Ok, please allow me a moment to check for the previous reservation.

USER: Sure, take your time to check and let me know the status.

ASSISTANT: I appreciate your patience. Rachel, there is no reservation found under your name.

USER: Oh! that's sad. Anyways, thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us.

USER: Thank you for assisting me.

ASSISTANT: Have a nice day.