You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jennifer Smith. Due to some changes in my business trip, I want to change my existing reservation.

ASSISTANT: Ok, can you please tell me how can I assist you?

USER: Can you help me?

ASSISTANT: Ok. Sorry to say, no reservation found on your name to change your reservation.

USER: No issues. Thank you for your time.

ASSISTANT: Thank you for reaching us.