You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you?

USER:  I am Dennis Lopez want to change my reservation due to heavy snow storm. Can you help me in changing?

ASSISTANT: Sure, I am here to help you. Please, standby.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a reservation on your name. Please, share the new journey dates.

USER: My travel dates are 01/08 and 01/10.

ASSISTANT: Let me know your source and destination points?

USER: I will depart from NY-LGA to TX-IAH.

ASSISTANT: Give me a  minute, I will let you know the flight availability.

USER:  Ok.

ASSISTANT: Thanks for your time, there are no flight found with your requirements. Thank you for approaching us.