You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Will you provide the service of changing the existing reservation?

ASSISTANT: Yes, we do provide changing reservation service also.

USER: Due to miscommunication between me and my friend, I have reserved the ticket to Dallas. Can you please change my existing reservation to Austin?

ASSISTANT: Sure, please let me know your good name, so that I will check your reservation is existing or not.

USER: Previously, I have made the reservation with the name George Martin.

ASSISTANT: Fine, give me a couple of seconds to check your reservation status.

USER: Sure, take your own time. I will wait for your response.

ASSISTANT: Thank you for your patience, there is no reservation found active under your name to do modifications in that.

USER: Oh! Seems like something went wrong while making the reservation previously.

ASSISTANT: Yes, may be that's the reason.

USER: Anyway, thanks for providing information. Happy with your service.

ASSISTANT: It's my pleasure, thank you for utilising our service. Have a great day.