You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have booked a fight ticket couple of days ago for vacation, now I want to change my journey dates. Help me to change in my reservation.

ASSISTANT: Sure, may I know your good name?

USER: My name is Joshua Harris.

ASSISTANT: Please wait a moment, I will check and get you back.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say that no reservation was found with your name.

USER: Thank you for the information.

ASSISTANT: Thank you, for connecting with us.