You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this minute?

USER: I have to change the trip dates because my friend is unable to travel now with us, so we have postponed the trip. Can you please help me to modify the details?

ASSISTANT: Sure, I am glad to serve you with that.

USER: Thank you.

ASSISTANT: Could you send me your good name?

USER: I have reserved my ticket under the name Catherine Parker. So, please check with that.

ASSISTANT: Ok, wait for a minute so that I will check the reservation status.

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

ASSISTANT: We are regret to inform you that, there is no reservation found on your name in our records.

USER: It's ok, not an issue. Anyhow thank you for providing the information.

ASSISTANT: Thank you for consulting us. Have a nice day.