You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Will you please change my trip dates of my existing reservation as my plan to go for trekking got postponed?

ASSISTANT: Sure, we are here to assist you. On whose name, the reservation has been made earlier?

USER: It was made under my name Kathleen Roberts.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.