You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I have to change the travel dates because I have to attend an important meeting so, I have postponed the trip. Can you please help me to change the details?

ASSISTANT: Sure, I will be helping you out, please mention your name to check the details?

USER: Thank you. My name is Kimberly Williams.

ASSISTANT: Please hold a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Williams, there are no active reservations to change your trip.

USER: It's ok, thank you for searching the ticket status.

ASSISTANT: Thank you for reaching our service.

USER: You are welcome.