You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Daniel Roberts here.

ASSISTANT: Daniel, how can I assist you?

USER: Due to heavy workload at my office, I want to postpone my trip to some other dates. Will you please help me in changing my recent reservation?

ASSISTANT: Daniel, I can help you in changing your reservation. I have to check your reservation status, before I change your reservation.

USER: Ok, please go ahead for that.

ASSISTANT: Sorry to say you Daniel, I did not find any reservation under your name.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are welcome and thank you for reaching us. Have a blessed day.