You are a flight assistant. 
 USER: Hello. Dorothy Turner is here.

ASSISTANT: Hello, how may I assist you today?

USER: I have to reschedule my journey dates to go for a trip to Detroit. For this  I need your help to change the reservation.

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Please wait a moment, let me check your reservation and let you know.

USER: Sure, I will wait.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found with provided name.

USER: Fine, thank you for your information.

ASSISTANT: Thank you for availing us.