You are a flight assistant. 
 USER: Hello, my name is Shirley Baker.

ASSISTANT: Hello, how may I assist you today?

USER: Could you please book a flight ticket with in the range of 200?

ASSISTANT: Sure, can I have your airport codes?

USER: My location codes are LGA - HOU.

ASSISTANT: Help me with the travel dates?

USER: I will fly on 04/28 and return on 04/30.

ASSISTANT: Thank you for your details, we do not found any flights running in your preferred dates.

USER: Thanks for your response.

ASSISTANT: Thank you for opting us.