You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brandon Thomas here.

ASSISTANT: How may I abet you today?

USER: I want to reserve my flight ticket from LGA to DEN, would you please help me to book a flight?

ASSISTANT: Sure, please mention your travelling dates?

USER: Sure, my itinerary dates are 11/19 and 11/21.

ASSISTANT: Please hold a moment, let me check with the availability.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Thomas, there are no flights running on your route due to heavy snowfall.

USER: It's ok, no more issues. Thank you for your information.

ASSISTANT: Thank you for reaching our service.