You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER:  I want to book a ticket from DFW to LGA to meet my uncle, can you help me?

ASSISTANT: Sure, I am mirthful to help you out. Please provide me your trip dates.

USER: Sure, I want to fly on 01/20 and back on 01/22.

ASSISTANT: May I know your name to proceed further?

USER: My name is Nicholas Evans.

ASSISTANT: Sorry, there is no flight in your route.

USER: Ok, not an issue. Thank you for helping me.

ASSISTANT: Thank you for reaching us.