You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: Joseph Young here.

ASSISTANT: How are you doing Mr. Joseph Young?

USER: Good. Can you change my previous reservation? Actually by mistake I have booked my tickets with wrong dates.

ASSISTANT: Sure, I can help you with that. Please give me a minute and I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your patience. Sorry, there is no existing reservation on your name.

USER: It's OK.

ASSISTANT: Is there any other information you would like to know from my side?

USER: No. Thank you for your concern.

ASSISTANT: Thank you for reaching us.