You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a flight ticket to Houston in the month of December to meet my friend. Can you help me in about that?

ASSISTANT: Sure, may I know your airport codes?

USER: Sure, my airport codes are HOU and IAH.

ASSISTANT: Please provide your trip dates.

USER: Ok, my trip dates are Dec 21 and Dec 23.

ASSISTANT: Which airlines do you prefer?

USER: I prefer normal-cost airlines.

ASSISTANT: At what time do you want to travel?

USER: I need to start from my location in the morning.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight for my journey.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: May I know your name?

USER: Sure, my name is Jacob Martinez.

ASSISTANT: Sorry Jacob Martinez, no flights are available as per your requirements.

USER: Not an issue with that, anyways thank you for the information.

ASSISTANT: Thank you for contacting us.