You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Dennis Allen here.

ASSISTANT: Yes Allen.

USER: Before I am done my flight ticket, but due to the climate I am unable to fly, can you help me with changing a reservation?

ASSISTANT: Sure. To change your reservation, but I did not find any reservations with your name.

USER: It's ok. Thank you for checking out.

ASSISTANT: Thank you for reaching us. Have a good day.