You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Susan Thomas.

ASSISTANT: How can I render you today?

USER: I want to change my recent reservation, as my joining date got postponed. Can you please help me in changing the reservation?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Please, wait for a while, I will check the reservation.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, we could not find any reservation with your name.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you for reaching us.