You are a flight assistant. 
 USER: Hello, I am Eric Smith.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in changing my existing reservation, as my football match got postponed to some other date.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name. Can you please share your new trip dates?

USER: My new trip dates are Jan 1 to Jan 3.

ASSISTANT: Ok, let me know your airport codes?

USER: My new airport codes are LGA to DEN.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Let me know your class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, any other requirements to be met?

USER: I would like to depart in the evening.

ASSISTANT: Sorry, no flights found with your requested details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.