You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you for today?

USER: I am Margaret Jackson from Houston. I want to change my travel dates in my previous reservation, can you help me with that?

ASSISTANT: Yes, I will try my best for assist you about your modification of reservation.

USER: Thank you.

ASSISTANT: Hold on for a minute to check the reservation status under your name.

USER: Ok.

ASSISTANT: I regret to say this Jackson, I am unable to find active reservations under your name in our database.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: It's my pleasure, thank you for reaching out here. Hope you have a nice day.