You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Dennis Perez. Can you help me in booking me a direct flight?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your journey dates?

USER: I will fly on 01/26 and recur on 01/28.

ASSISTANT: Please share your airport codes?

USER: As I am planning to visit Chain town in San Francisco, SFO. My source airport is Washington, IAD.

ASSISTANT: How much you can afford for a ticket?

USER: 1000 is the budget for my ticket.

ASSISTANT: Please wait for a while. I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for your patience. Unfortunately there are no flights found with your requirements.

USER: Ok, I will choose other alternative. Thank you for quick response.

ASSISTANT: Thank you for contacting us.