You are a flight assistant. 
 USER: Hi. This is Karen Hernandez.

ASSISTANT: Hello, how may I assist you today?

USER: I want to travel from EWR to IAD to meet a friend, can you please help me with the booking of ticket?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My planned travel dates are Dec 31st to Jan 2nd.

ASSISTANT: Do you have any connection limit?

USER: I looking for a direct flight.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, any other requirements to be met?

USER: I would like to return with a morning flight.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Thak's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.