You are a flight assistant. 
 USER: Hello. Amy Mitchell here.

ASSISTANT: Hello, how may I oblige you today?

USER: I promised to meet my sister on my niece's birthday party. So, can you please check for the flights from IAD to DEW?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My journey will start on June 19th and I will be returning back on June 21st.

ASSISTANT: Ok, please wait for a while.

USER: I need a single connection flight.

ASSISTANT: Can you please recheck your destination airport code?

USER: My designation airport code is DFW.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Oh! That's very disappointing to know from you. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.